package pack;
import network.Server;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TCPServer {
    private ServerSocket serverSocket = null;

    public TCPServer(int port) throws IOException {
        serverSocket = new ServerSocket(port);
    }

    public void start() throws IOException {
        System.out.println("启动服务器");
        ExecutorService pool = Executors.newCachedThreadPool();
        while (true){
            Socket clientSocket =  serverSocket.accept();
            pool.submit(() ->{
                try {
                    processConnection(clientSocket);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            });
        }
    }

    private void processConnection(Socket clientSocket) throws IOException {
        System.out.printf("[%s:%d] 客户端上线!\n", clientSocket.getInetAddress().toString(), clientSocket.getPort());
        try (InputStream inputStream = clientSocket.getInputStream();
             OutputStream outputStream = clientSocket.getOutputStream()) {
            while(true){
                Scanner scanner = new Scanner(inputStream);
                if(!scanner.hasNext()){
                    System.out.printf("[%s:%d] 客户端下线!\n", clientSocket.getInetAddress().toString(), clientSocket.getPort());
                    break;
                }
                String request = scanner.next();
                String response = process(request);
                PrintWriter printWriter = new PrintWriter(outputStream);
                printWriter.println(response);
                printWriter.flush();
                System.out.printf("[%s:%d] req: %s; resp: %s \n", clientSocket.getInetAddress().toString(), clientSocket.getPort(),request, response);
            }
        }catch (IOException e){
            e.printStackTrace();
        }
        finally {
            clientSocket.close();
        }
    }

    public String process(String request) {
        return request;
    }

    public static void main(String[] args) throws IOException {
        TCPServer tcpServer = new TCPServer(9090);
        tcpServer.start();
    }
}
